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12/2.5 = x/7 // - x/7
12/2.5-(x/7) = 0
4.8-1/7*x = 0 // - 4.8
-1/7*x = -4.8 // : -1/7
x = -4.8/(-1/7)
x = 33.60000067
x = 33.60000067
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